I really liked the idea that you presented in the first stanza, about the candle and your confidence. I find it quite clever actually.

I also find the last stanza a tad bitter but then turns hopeful- it like it. The persona feels that he is going to make the same mistake but then realises that on this occasion it might not be so. So for me, it feels like the persona is going "should I or shouldn't I put my trust into this situation" No one likes reliving mistakes and you capture this perfectly in this last stanza.

I absolutely love the candle analogy, how true and fresh a thought. The hopeful, excited, but trying to talk yourself out and then back into those feelings is wonderfully alive. Great job with this one.